Typewriter



April 18, 1933.

A. ATEMAN.

TYPEWRITER 2 Sheets-Sheet 1 Filed May 17 1932 April 18, 1933. A p -N1,904,518

TYPEWRITER Filed May 17, 1932 2 Sheets-Sheet 2 Patented Apr. 18, 1933UNITED STATES PATENT OFFICE ARTHUR PATEMAN, OF LEICESTER, ENGLAND,ASSIGNOR TO IMPERIAL TYPEWRITER f COMPANY LIMITED, OF LONDON, ENGLAND, ABRITISH COMPANY TYPEWRITER I Application filed May 17, 1932, Serial No.611,894, and in GreatBritain September 18, 1931'.

This invention is for improvements in or relating to typewriters and isconcerned with typewriters of the kind comprising a framework housingthe type mechanism, including the type bars and operating levers, whichframework has a top member at least partially covering the typemechanism. Generally this top member carries the platen and the ribbonspools.

One object of the present invention is to render the type mechanismwithin the framework more readily accessible and the invention comprisesa typewriter of the kind described, characterized in that the top memberof the framework is readily movable away from the main part of theframe, for

example, is hinged thereto, in order to render the type mechanism easilyaccessible, for

example, for its removal from the framework.

In one form of the typewriter according to this invention the top memberof the framework is hinged to the main part of the frame about an axisparallel to that of the platen and at the rear side of the framework andspring-operated latches are preferably provided for retaining the topmember of the frame in the normal closed position. In a preferredconstruction these latches comprise levers pivoted on the main part ofthe framework and formed with cam slots engaging studs carried by thetop member. By reason of the camrned form of the slots engaging thestuds the top member is drawn tightly down on the main part of the frameby the closing of the latches. Conveniently the studs are eccentricallymounted and are provided with means for adjustment in order to ensurethat the latches shall firmly hold the top member in the closed positionby reason of the cam slots of the latch levers.

The invention will now be further described by way of example withreference to the accompanying drawings illustrating one form oftypewriter according to this invention.

In the accompanying drawings:

Figure 1 is a side elevation with the top 50 member in the closedposition;

Figure 2 is an oppositeside elevation with the top member in the openposition, I

Flgure 3 is a detail view of one hinge for the top member of theframework;

Figure 4; is a View at right-angles to Figure 3; w

Figure 5 is adetail view of the springclosed latch in the closedposition;

Figure 6 is a view at right-angles to Figure 5;

Figure 7 is a view similar to Figure 5 of the latch in the extendedposition; and

Figure 8 is a detail of a holding'down stud for the type mechanism.

In the several figures of the drawings like reference numerals serve toindicate like parts. 7 1 I The main frame of the typewriter indicated at10 carries brackets 11 one on each side of the frame upon which bracketsthe type mechanism indicated in outline at 12 is supported by means ofstuds 13.

The top-member 14 of the framework carrying the platen carriageindicated at 15 and spools 16 is hinged at the rear side to the mainpart 10 of the framework by-means of two hinges 17 one on each side ofthe framework. I i

The hinges 17, as shown in detail in Figures 3 and 4:, each'consists ofa lug 19 depending from the top member of the frame and located in arecess 20 provided in the rear wall of the main part 10 of the frameworkby means of a pivot pin 21 screw-threadedin the'lug and having a bearingin. the main frame. The depending lug 19 is formed with an extension 22which abuts against a stop 23 provided on the main frame 10 in order tolimit the opening movement of the top member'l l. I

The top member 1 1 of the framework is retained in the normally closedposition bymeans of spring-operated latches 18 one-on each sideof theframework near the front. Referring moreparticularly to Figures 5, 6 95and 7 of the drawings, the top member 14 of the framework is providedwith depending lugs 25 each carrying a transverse screwthreaded stud 26,this stud having a cylindrical head 27 and being secured by nuts 28.

The latches each comprise a lever 29 pivoted by means of a stud 30 onthe main part 10 of the framework and formed with an open-ended cam slot31. The lever 29 is urged to the closed position of the latch by meansof a-tension spring 32, and is provided with an operating knob 33projecting through a slot 34 in the main framework to the outer sidethereof. A stop 39 serves to limit the range of movement of the lever.

In the. open position of the top member the lever 29 assumes anapproximately vertical position bearing against the stop 39 un-' der theaction of the spring 32. The end ofthe lever is formed with a strikingsurface 36 and in the closing movement of the top member the head27 ofthe stud 26 bears upon this surface and deflects the lever against theaction of the spring 32 until the stud head is opposite the open end ofthe slot 31 as shown in Figure 7. The lever 29 is then moved by thespring 32 and the slot 31 passes over the stud to hold the top member ofthe framework in the closed position.

The slot 31 in the lever 29 is so constructed that the radial dimensionfrom the pivot 21 of the lever decreases slightly from the open end inorder to exert a wedging action on the stud head 27 to hold the topmember firmly in the closed position. Furthermore, in order to ensureclose fitting of the latch, the head 27 of the stud 26 is slightlyeccentric and the position of the head may thus be adjusted by rotationof the stud.

In order to retain the type mechanism firmlyin position when the topmember is closed, the latter is provided with two studs 37 one on eachside of the frame, which studs, in the closedposition of thetop member,bear upon 40? the type unit. Each of these studs is carried in a boss-40formed with the top member of the framework. Each stud 37 (see Figure 8)is provided with a collar 41 and a compression spring 42between thecollar, and a web 43 in the boss, so that the stud is springpressedagainst the type mechanism. The stud isalso provided with a retainingcollar 44.

By means of the hinged construction, the

topmember of the framework is readily moved, onreleasing the latches bymeans of the operating knobs 33, from the normally closed position, asindicated in Figure 1, to the open position, as shown in Figure 2, to

render the type mechanism easily accessible. The type mechanism 12 canalsobe removed as a unit from its normal position in the frameworkwithout any difficulty.

I It is to be understood that the invention is not restricted to theparticular construc tion hereinbefore described with reference to theaccompanying drawings. For example, the invention may be applied totypewriters as described in specification No. 257,660 in '65 which thetypemecha-nismis supported on runners within the framework and ismovable forwardly on these runners to permit the type mechanism to bewithdrawn from the front of the machine. The removal of the typemechanism in this construction requires somewhat adept handling, inorder to avoid fouling of parts of the type mechanism with theframework. By providing a readily movable top member of frameworkaccording to the present invention, the type mechanism may be'removedfrom the machine with the utmost ease.

I claim In a typewriter the combination of a framework, bearing memberswithin said framework, type mechanism removably mounted within saidframework and supported-on said bearing members, a top member at leastpartially covering said type mechanism, a hinge connection between saidtop member and said framework, locking means for retaining the topmember in the closed position and hearing members on said top. memberand en-.

gaging the type mechanism in theclosed posi-.

tion of the top member to retain the type mechanism firmly in place.

' In testimony whereof I afiiX my signature.

ARTHUR PATEMAN.

